Tropical coastal communities are highly reliant on coral reefs, which provide nutrition and employment for millions of people. Climate-driven coral bleaching events are fundamentally changing coral reef ecosystems and are predicted to reduce productivity of coral reef fish and fisheries, with significant implications for food security and livelihoods. Yet evidence of long-term bleaching impacts on coral reef fishery productivity is lacking. Here, we analyse over 20 years of fish abundance, catch and habitat data to assess long-term impacts of climate-driven coral mass mortality and regime shifts on nearshore artisanal coral reef fisheries in the Seychelles. Contrary to expectations, total catch and mean catch rates were maintained or increased after coral bleaching, consistent with increasing abundance of herbivorous target species in underwater surveys, particularly on macroalgal-dominated reefs. Catch instability increased as habitats followed divergent post-disturbance trajectories and the distribution of target species became more spatially variable, potentially impacting fisher incomes and local market supply chains. Although coral bleaching increased fishery dependence on herbivore species, our results show that climate-impacted reefs can still provide livelihoods and fish protein for coastal communities.
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Pauly, D. et al. Towards sustainability in world fisheries. Nature 418, 689–695 (2002).
Tacon, A. G. J. & Metian, M. Fish matters: importance of aquatic foods in human nutrition and global food supply. Rev. Fish. Sci. 21, 22–38 (2013).
Teh, L. S. L., Teh, L. C. L. & Sumaila, U. R. A global estimate of the number of coral reef fishers. PLoS ONE 8, e65397 (2013).
Hughes, T. P. et al. Spatial and temporal patterns of mass bleaching of corals in the Anthropocene. Science 359, 80–83 (2018).
Halford, A. R. & Caley, M. J. Towards an understanding of resilience in isolated coral reefs. Glob. Change Biol. 15, 3031–3045 (2009).
Pratchett, M. S., Hoey, A. S. & Wilson, S. K. Reef degradation and the loss of critical ecosystem goods and services provided by coral reef fishes. Curr. Opin. Env. Sust. 7, 37–43 (2014).
Graham, N. A. J., Jennings, S., MacNeil, M. A., Mouillot, D. & Wilson, S. K. Predicting climate-driven regime shifts versus rebound potential in coral reefs. Nature 518, 94–97 (2015).
Rogers, A., Blanchard, J. L. & Mumby, P. J. Vulnerability of coral reef fisheries to a loss of structural complexity. Curr. Biol. 24, 1000–1005 (2014).
Bell, J. D. et al. Mixed responses of tropical Pacific fisheries and aquaculture to climate change. Nat. Clim. Change 3, 591–599 (2013).
Cinner, J. E. et al. Vulnerability of coastal communities to key impacts of climate change on coral reef fisheries. Glob. Environ. Change 22, 12–20 (2012).
Gilmour, J. P., Smith, L. D., Heyward, A. J., Baird, A. H. & Pratchett, M. S. Recovery of an isolated coral reef system following severe disturbance. Science 340, 69–71 (2013).
Graham, N. A. J. et al. Lag effects in the impacts of mass coral bleaching on coral reef fish, fisheries, and ecosystems. Conserv. Biol. 21, 1291–1300 (2007).
McClanahan, T. R., Hicks, C. C. & Darling, E. S. Malthusian overfishing and efforts to overcome it on Kenyan coral reefs. Ecol. Appl. 18, 1516–1529 (2008).
Dalzell, P., Adams, T. J. H. & Polunin, N. V. C. Coastal fisheries in the Pacific Islands. Oceanogr. Mar. Biol. 34, 395–531 (1996).
Hawkins, J. P., Roberts, C. M. & Gell, F. R. Effects of trap fishing on reef fish communities. Aquat. Conserv. 17, 111–132 (2007).
Daw, T. M., Robinson, J. & Graham, N. A. J. Perceptions of trends in Seychelles artisanal trap fisheries: comparing catch monitoring, underwater visual census and fishers’ knowledge. Environ. Conserv. 38, 75–88 (2011).
Robinson, J. et al. The importance of targeted spawning aggregation fishing to the management of Seychelles’ trap fishery. Fish. Res. 112, 96–103 (2011).
Hempson, T. N., Graham, N. A. J., MacNeil, M. A., Hoey, A. S. & Wilson, S. K. Ecosystem regime shifts disrupt trophic structure. Ecol. Appl. 28, 191–200 (2018).
Chong-Seng, K. M., Nash, K. L., Bellwood, D. R. & Graham, N. A. J. Macroalgal herbivory on recovering versus degrading coral reefs. Coral Reefs 33, 409–419 (2014).
Evans, R. D., Wilson, S. K., Field, S. N. & Moore, J. A. Y. Importance of macroalgal fields as coral reef fish nursery habitat in north-west Australia. Mar. Biol. 161, 599–607 (2014).
Hoey, A. S. & Bellwood, D. R. Suppression of herbivory by macroalgal density: a critical feedback on coral reefs? Ecol. Lett. 14, 267–273 (2011).
Rogers, A., Blanchard, J. L. & Mumby, P. J. Fisheries productivity under progressive coral reef degradation. J. Appl. Ecol. 55, 1041–1049 (2018).
Russ, G. R., Questel, S.-L. A., Rizzari, J. R. & Alcala, A. C. The parrotfish–coral relationship: refuting the ubiquity of a prevailing paradigm. Mar. Biol. 162, 2029–2045 (2015).
Wilson, S. K. et al. Exploitation and habitat degradation as agents of change within coral reef fish communities. Glob. Change Biol. 14, 2796–2809 (2008).
Wilson, S. K. et al. Climatic conditions and nursery habitat quality provide indicators of reef fish recruitment strength. Limnol. Oceanogr. 62, 1868–1880 (2017).
Halpern, B. S., Gaines, S. D. & Warner, R. R. Habitat size, recruitment, and longevity as factors limiting population size in stage-structured species. Am. Nat. 165, 82–94 (2005).
Rouyer, T., Sadykov, A., Ohlberger, J. & Stenseth, N. C. Does increasing mortality change the response of fish populations to environmental fluctuations? Ecol. Lett. 15, 658–665 (2012).
Grandcourt, E. M. Demographic characteristics of a selection of exploited reef fish from the Seychelles: preliminary study. Mar. Freshw. Res. 53, 123–130 (2002).
Allison, E. H. & Ellis, F. The livelihoods approach and management of small-scale fisheries. Mar. Policy 25, 377–388 (2001).
Cinner, J. E., Daw, T. & McClanahan, T. R. Socioeconomic factors that affect artisanal fishers’ readiness to exit a declining fishery. Conserv. Biol. 23, 124–130 (2009).
Johnson, A. E. Reducing bycatch in coral reef trap fisheries: escape gaps as a step towards sustainability. Mar. Ecol. Prog. Ser. 415, 201–209 (2010).
van Hooidonk, R. et al. Local-scale projections of coral reef futures and implications of the Paris Agreement. Sci. Rep. 6, 39666 (2016).
Bellwood, D. R., Hughes, T. P., Folke, C. & Nyström, M. Confronting the coral reef crisis. Nature 429, 827–833 (2004).
Bozec, Y.-M., O’Farrell, S., Bruggemann, J. H., Luckhurst, B. E. & Mumby, P. J. Tradeoffs between fisheries harvest and the resilience of coral reefs. Proc. Natl Acad. Sci. USA 113, 4536–4541 (2016).
Nash, K. L., Graham, N. A. J., Jennings, S., Wilson, S. K. & Bellwood, D. R. Herbivore cross‐scale redundancy supports response diversity and promotes coral reef resilience. J. Appl. Ecol. 53, 646–655 (2015).
Grandcourt, E. M. & Cesar, H. S. J. The bio-economic impact of mass coral mortality on the coastal reef fisheries of the Seychelles. Fish. Res. 60, 539–550 (2003).
Clifton, J. et al. Marine conservation policy in Seychelles: current constraints and prospects for improvement. Mar. Policy 36, 823–831 (2012).
Seychelles Artisanal Fisheries Statistics for 2015 (Seychelles Fishing Authority, 2016).
Mees, C. C. Seychelles Artisanal Catch Assessment Survey: Notes for Implementation (Seychelles Fishing Authority, 1990).
Currie, J. C. et al. Indian Ocean Dipole and El Niño/Southern Oscillation impacts on regional chlorophyll anomalies in the Indian Ocean. Biogeosciences 10, 6677–6698 (2013).
Wilson, S. K. et al. Climatic forcing and larval dispersal capabilities shape the replenishment of fishes and their habitat-forming biota on a tropical coral reef. Ecol. Evol. 8, 1918–1928 (2018).
Robinson, J., Graham, N., Grüss, A., Gerry, C. & Bijoux, J. Fishery benefits from exploiting spawning aggregations not solely dependent on enhanced fish density. Afr. J. Mar. Sci. 39, 269–278 (2017).
Smith, C. A. & Sardeshmukh, P. D. The effect of ENSO on the intraseasonal variance of surface temperatures in winter. Int. J. Climatol. 20, 1543–1557 (2000).
Saji, N. H., Goswami, B. N., Vinayachandran, P. N. & Yamagata, T. A dipole mode in the tropical Indian Ocean. Nature 401, 360–363 (1999).
Saji, N. H. & Yamagata, T. Possible impacts of Indian Ocean Dipole mode events on global climate. Clim. Res. 25, 151–169 (2003).
Polunin, N. V. C. & Roberts, C. M. Greater biomass and value of target coral-reef fishes in two small Caribbean marine reserves. Mar. Ecol. Prog. Ser. 100, 167–176 (1993).
McClanahan, T. R. et al. The influence of instantaneous variation on estimates of coral reef fish populations and communities. Mar. Ecol. Prog. Ser. 340, 221–234 (2007).
Froese, R. & Pauly, D. FishBase (2011); www.fishbase.org
Jennings, S. & Polunin, N. V. C. Biased underwater visual census biomass estimates for target-species in tropical reef fisheries. J. Fish Biol. 47, 733–736 (1995).
Burnham, K. P. & Anderson, D. R. Model Selection and Multimodel Inference: A Practical Information-Theoretic Approach (Springer Science & Business Media, Berlin, 2002).
Wood, S. N. Generalized Additive Models: An Introduction with R 2nd edn (CRC Press, Boca Raton, 2017).
Anderson, M. J. Distance-based tests for homogeneity of multivariate dispersions. Biometrics 62, 245–253 (2006).
Litzow, M. A., Mueter, F. J. & Hobday, A. J. Reassessing regime shifts in the North Pacific: incremental climate change and commercial fishing are necessary for explaining decadal-scale biological variability. Glob. Change Biol. 20, 38–50 (2014).
R Core Team R: A Language and Environment for Statistical Computing (R Foundation for Statistical Computing, 2017).
Oksanen, J. et al. vegan: Community Ecology Package. R package version 2.4-4 (2017); https://CRAN.Rproject.org/package=vegan
This paper is dedicated to the memory of Edwin Mark Grandcourt, a pioneering Seychellois fisheries scientist who made significant contributions to establishing the underwater dataset and catch assessment surveys used in this paper, which now help shape our understanding of coral reef fisheries in Seychelles and across the world. This research was supported by the Royal Society (grant nos. CH160077 and UF140691), the Leverhulme Trust (grant no. F/00 125/M) and the Australian Research Council (grant nos. DP1094932 and DE130101705). We thank the fisheries observers and data technicians of SFA for data collection, and Seychelles Marine Parks Authority, Nature Seychelles and Global Vision International for field assistance.
The authors declare no competing interests.
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Robinson, J.P.W., Wilson, S.K., Robinson, J. et al. Productive instability of coral reef fisheries after climate-driven regime shifts. Nat Ecol Evol 3, 183–190 (2019). https://doi.org/10.1038/s41559-018-0715-z
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